Can no longer access SD card from PC

Recently the behavior of my phone changed when plugged in to my Windows XP computer USB.

I used to get three things, one explorer window open to drive I: and two other auto play windows for the internal memory and the SD card. Not I'm only getting the internal memory and drive I:.

There have been no changes to the PC and the only thing I can think I did on the phone was install ES File Manager so I could browse my NAS at home. I can't imagine installing that file manager caused the problem, right?

I also have not been able to figure out where the drive I: that comes up is pointing on the phone.